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  1. J

    CAT 420F HAND THROTTLE SWITCH NOT WORKING - Need Wiring Schematic

    Thanks for that - i have that resolved now but it wasn't what was causing the hand throttle not to work.. A little more digging and i realized there has been a code that i've been ignoring but I think it may be the cause. If you have diagnostic procedure for this one, from what i've read it may...
  2. J

    CAT 420F HAND THROTTLE SWITCH NOT WORKING - Need Wiring Schematic

    I installed two brand new speed sensors - figured while i was in there I might as well put new ones in so I don't have to get back in there again or second guess it.
  3. J

    CAT 420F HAND THROTTLE SWITCH NOT WORKING - Need Wiring Schematic

    No fault codes on the sensors. Wiring looked good, i put new sensors in and fixed a can resistor that was unhooked and now when it starts up and i move the hand throttle the green throttle light goes on for 20 seconds or so and then goes off. Still no tach or change in engine speed when using...
  4. J

    CAT 420F HAND THROTTLE SWITCH NOT WORKING - Need Wiring Schematic

    I plugged the computer in to the hoe and the switch is working perfectly, and everything else seems to be in order aside from the fact that the reading on the engine speed is "-1".. I'm guessing this is my problem. Has anyone else seen this? Is it as simple as replacing a engine speed sensor?
  5. J

    CAT 420F HAND THROTTLE SWITCH NOT WORKING - Need Wiring Schematic

    I wish that worked - it won't throttle up at all, brakes or not. I'm wondering if it has something to do with the auto throttle feature but this is the first machine i've had that isn't all mechanical. Not sure "upgrading" was the right thing to do.
  6. J

    CAT 420F HAND THROTTLE SWITCH NOT WORKING - Need Wiring Schematic

    I recently bought a used '13 420F and among other issues I've found, the hand throttle dial doesn't work. I tested a few 420's at ritchie bros the month before I drove it and those didn't work either - is there some kind of safety switch or procedure to allow it to engage? It looks like the...
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